first of all, his defense is straight up poor. Too slow & not strong enough. He scores 11 a night and gives up a lot more than that way too often.
If you call a fade-away jumper post game then ok he's got a post game. Still can't take anyone in the league off the dribble.
As far as regressing, too many times last year did he miss his first few shots then passed up on open ones later in the game. Especially the end of the year when they were battling for a playoff spot. He tightened up so bad in certain games...it was disappointing. In theory you are right, he SHOULD be able to open the floor up, but in this case they practically left him wide open and doubled AI knowing he would either hesitate and miss or give up the shot completely. That's why he regressed.